I was told to count three months past your due date, that would be the month you conceived only the previous year. So if due August 17, you conceived around November 17th. Just info shared with me, hope it helps.
Maybe the beginning of December.
Do you know how far along you are? If you are due this august, I would say you concieved around the middle to end of november maybe? Probably 7-8 months?? Im horrible at math lol im trying here. If im correct then November. If you are looking for something more accurate only a doctor can help you with that.